Portion of a base for a joystick controller



FIG. 1 is a perspective view of the portion of a base for a joystick controller showing my new design;

FIG. 2 is a first elevational view thereof;

FIG. 3 is a second elevational view thereof taken approximately 90 degrees from the first elevational view of FIG. 2; and,

FIG. 4 is a top plan view thereof.

The bottom of the base forms no part of the claimed design. The broken line showing of the remainder of the base in FIGS. 1-4 and the handle in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a base for a joystick controller, as shown and described. 